a(n) = 1*t(n) + 2*t(n-1) + ... + k*t(n+1-k), where k=floor((n+1)/2) and t(n)=2*n+1 (odd numbers).

Terms

a(0) =1a(1) =3a(2) =11a(3) =17a(4) =38a(5) =50a(6) =90a(7) =110a(8) =175a(9) =205a(10) =301a(11) =343a(12) =476a(13) =532a(14) =708a(15) =780a(16) =1005a(17) =1095a(18) =1375a(19) =1485a(20) =1826a(21) =1958a(22) =2366a(23) =2522a(24) =3003a(25) =3185a(26) =3745a(27) =3955a(28) =4600a(29) =4840